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Added 17 days ago
Staff Data Platform Engineer - Snowflake
RBC
Toronto, ON
Full-time
Join RBC's Cloud Data Lake Platform (Snowflake) Engineering team as a Staff Data Platform Engineer, where you'll play a critical role in designing, building, and operating one of Canada's…
Added 12 days ago
Staff Data Platform Engineer - Snowflake
Royal Bank of Canada
Toronto, ON
Full-time
Join RBC's Cloud Data Lake Platform (Snowflake) Engineering team as a Staff Data Platform Engineer, where you'll play a critical role in designing, building, and operating one of Canada's…
Added 3 days ago
Lead Data Platform Engineer
SRA Group
Toronto, ON
Contract
Partner with Product Managers, Data Science, Platform Strategy, and Technology teams to understand analytical and data requirements and translate them into scalable engineering solutions.
Added 3 days ago
Data Engineer Tech Lead
Iris Software Inc.
Mississauga, ON
Contract
5-8 years SQL & Python; cloud data platform experience (Snowflake highly preferred)
Added 4 days ago
Data Engineer – Data Platform (AI-Enabled)
Jobgether
Canada
Full-time
This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Data Engineer – Data Platform (AI-Enabled) based in Canada.
Added 4 days ago
Data Platform Engineer
Apexon
Toronto, ON
Full-time
The primary focus of this role will be to design, build, and maintain the EMFI Data Application Platform, a financial analytics application. The incumbent will work across the full stack to…
Added 12 days ago
Senior Software Engineer
Symend
Remote, Canada
Full-time · Remote
The Senior Software Engineer is responsible for producing and implementing functional software solutions that align with the client needs and business goals. This role is responsible for…
Added 12 days ago
Data Engineer, Data Integration & Performance Platform (12-Month Contract)
OMERS
Toronto, ON · Head Office Toronto
Full-time
This is an entry‑level engineering role on a multi‑year investment platform transformation that is replacing our core investment book of record with BlackRock Aladdin and building a new…
Added 20 days ago
Senior Data Engineer
RBC
Vancouver, BC
Full-time
In this role as a Senior Data Engineer, you will be responsible for development deliverables for the Finance Data Platform. The Platform, leverages Airflow and Databricks and serves as the…
Added 16 days ago
Senior Data Engineer
Royal Bank of Canada
Vancouver, BC
Full-time
In this role as a Senior Data Engineer, you will be responsible for development deliverables for the Finance Data Platform. The Platform, leverages Airflow and Databricks and serves as the…
Added 1 month ago
Intermediate Data Engineer
Sandman Hotel Group
BC · West Vancouver, BC
Full-time
We're looking for a Data Engineer to design and build the pipelines and data architecture that power analytics, reporting, and governance across the business. You'll spend most of your time…
Added 1 month ago
Ingénieur de données-Palantir Foundry
CGI
Montreal, QC
Full-time
We are seeking an experienced Data Engineer specializing in Palantir Foundry to join a large scale enterprise data and analytics transformation program. The successful candidate will play a…
Added 1 month ago
Staff Engineer - Experimentation Platform
Faire
Toronto, ON · Kitchener, ON
Faire is a technology wholesale platform built on the belief that the future is local. Independent retailers around the globe collectively represent a multi-hundred-billion-dollar wholesale…
Added 16 days ago
Senior Data Engineer
Royal Bank of Canada
Vancouver, BC
Full-time
In this role as a Senior Data Engineer, you will be responsible for development deliverables for the Finance Data Platform. The Platform, leverages Airflow and Databricks and serves as the…
Added 2 months ago
Data Platform Engineer
Princeton IT Services, Inc
Toronto, Ontario
Contract
The primary focus of this role will be to design, build, and maintain the EMFI Data Application Platform, a financial analytics application. The incumbent will work across the full stack to…
Added 12 days ago
Staff Software Reliability Engineer - Data Platform
Okta
Toronto, ON
This is an opportunity for experienced Software Reliability Engineers to join our fast growing Data Platform organization that is passionate about scaling high volume, low-latency,…
Added 9 days ago
Data Engineer
Hays
Toronto, ON · North York, ON
Contract
· Hands-on experience with Google Cloud Platform (GCP) services and cloud-based data architectures.
Added 10 days ago
Staff Software Engineer, App Runtime
Snowflake
Toronto, ON
Full-time
As a Staff/Principal Engineer, you will shape the product and its architecture. It’s a high leverage role - you will lead a team to scale and harden an early-stage, public-preview product.…
Added 2 days ago
Senior Data Quality Engineer - Zonda - Toronto, ON
CoStar
Toronto, ON
$120,000 to $150,000 CAD / year
Full-time
We are looking for a Senior Data Quality Engineer to build and operate the testing and validation capabilities that ensure data delivered through our enterprise data platform is accurate,…
Added 2 days ago
Senior Data Platform Engineer - Zonda - Toronto, ON
CoStar
Toronto, ON
$140,000 to $170,000 CAD / year
Full-time
Senior Data Platform Engineer: Senior Data Platform Engineer – Zonda – Toronto, ON
Added 1 day ago
Senior Data Engineer
Boardwalk
Calgary, AB
Contract
The Senior Data Engineer provides architectural direction, technical leadership, and execution oversight for our core database modernization initiative. This role is responsible for shaping…
Added 9 days ago
Senior Software Developer - SQL/Python
RBC
Toronto, ON
Full-time
We are seeking an experienced Senior Software Engineer to work within Wealth Management Global IT Data Services Canada - As a Senior Software Engineer, specializing in AI-driven agent…
Added 6 days ago
Lead Full Stack Developer
RBC
Toronto, ON
Full-time
This engineer will need to be very proficient in managing large sets of data, including excellent proficiency with ANSI-SQL querying structured and unstructured data sources (Snowflake,…
Added 4 days ago
Senior Manager, Engineering & Build
RBC
Toronto, ON
Full-time
Design and build batch and incremental pipelines across Bronze/Silver/Gold layers using Snowflake (Streams, Tasks, Snowpark, Snowpipes), Spark, and dbt.
Added 6 days ago
Data Platform Engineering Manager
TD
Toronto, ON
Full-time
The Data Platform Engineering Manager role is responsible for designing, building, and operating the enterprise technology reference data platform that serves as the foundation for…

CoStar

Senior Data Quality Engineer - Zonda - Toronto, ON

Toronto, ON, Canada

Pay: $120,000 to $150,000 CAD / year
Job type: Full-time
Posting language: English
Posted: Sep 18, 2026

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Original job description

Senior Data Quality Engineer - Zonda - Toronto, ON

<br>

Job Description

<br>

Senior Data Quality Engineer: Senior Data Quality Engineer – Zonda – Toronto, ON

Company Overview:

CoStar Group (NASDAQ: CSGP) is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. Included in the S&P 500 Index, CoStar Group is on a mission to digitize the world’s real estate, empowering all people to discover properties, insights and connections that improve their businesses and lives.

We have been living and breathing the world of real estate information and online marketplaces for over 35 years, giving us the perspective to create truly unique and valuable offerings to our customers. We’ve continually refined, transformed, and perfected our approach to our business, creating a language that has become standard in our industry, for our customers, and even our competitors. We continue that effort today and are always working to improve and drive innovation. This is how we deliver for our customers, our employees, and investors. By equipping the brightest minds with the best resources available, we provide an invaluable edge in real estate.

About Zonda:

Zonda is redefining the future of housing. We are perfectly placed in the heart of the fast-growing real estate industry. We are making big bets on the future of real-estate, trailblazing a 2030 vision for the industry. Here at Zonda, you’ll be able to use your passion and curiosity to drive the next generation of real estate analysts, advisors, technologists, and marketers.

Learn more about Zonda

We are looking for a Senior Data Quality Engineer to build and operate the testing and validation capabilities that ensure data delivered through our enterprise data platform is accurate, complete, consistent, and fit for business use.

Our environment includes Snowflake, AWS Aurora/RDS, Amazon MWAA/Apache Airflow, dbt, AWS Glue, Amazon S3, DataHub, Grafana, and CloudWatch.

This is a hands-on senior engineering role focused on end-to-end data pipeline testing, automated validation, regression testing, test-data management, and business-rule verification.

A major part of the role is partnering with Product, Research, Advisory, Economics, Data Engineering, and other business subject-matter experts to translate business definitions, methodologies, and expected outcomes into measurable and repeatable tests.

Data Engineers remain responsible for testing the pipelines and transformations they build. The Senior Data Quality Engineer provides reusable testing frameworks, curated test data, broader regression coverage, and independent validation for critical or higher-risk changes.

Responsibilities:

Data Pipeline & Regression Testing

Design and execute testing strategies for ETL/ELT pipelines, transformations, integrations, and published data products.
Validate data end to end, from source ingestion through transformation and final output.
Perform source-to-target reconciliation to validate completeness, accuracy, mappings, calculations, aggregations, joins, filters, and business rules.
Build regression coverage to detect unintended changes caused by pipeline, schema, transformation, or business-rule updates.
Test large datasets using appropriate sampling, aggregate reconciliation, full-population comparisons, and targeted edge cases.
Validate nulls, duplicates, referential integrity, incremental processing, historical behavior, distributions, and other material data conditions.

Business-Driven Test Design

Work with business and domain experts to understand how critical data is expected to behave.
Translate agreed business definitions, methodologies, calculations, and acceptance criteria into executable test scenarios.
Identify business-critical attributes, expected outcomes, edge cases, and quality thresholds.
Validate whether outputs conform to agreed business expectations, not simply whether pipelines execute successfully.
Maintain traceability between requirements, test cases, defects, and release-validation evidence.

Test Data Management

Create and maintain curated test datasets and expected results representing common scenarios, edge cases, historical conditions, and known failure modes.
Work with business SMEs and Data Engineers to identify representative records and expected outcomes.
Use synthetic, masked, controlled, or approved production-derived data as appropriate to maintain safe test-data practices.
Maintain reusable baseline datasets as source data, schemas, methodologies, and business rules evolve.

Automation & Quality Frameworks

Develop reusable automated validation frameworks using SQL, Python, dbt, and other appropriate technologies.
Automate checks for freshness, volume, completeness, uniqueness, validity, referential integrity, business rules, reconciliation, distribution, and drift.
Build standardized testing patterns reusable across data products and pipelines.
Partner with Data Platform Engineering to integrate quality checks into CI/CD, dbt, Airflow/MWAA, and release workflows.
Enable critical validation failures to prevent downstream execution or publication where agreed quality thresholds are not met.

Release Validation & Monitoring

Maintain risk-based regression suites for critical data products and pipelines.
Independently validate material or higher-risk data releases before production publication.
Compare candidate outputs against approved baselines or production results to identify unexpected differences.
Provide objective quality evidence, identified risks, and release-readiness recommendations; business and product owners retain responsibility for business acceptance and publication decisions.
Perform post-release validation for critical changes.
Establish ongoing monitoring for key data-quality indicators and partner with Data Platform Engineering to surface actionable alerts through Grafana, CloudWatch, DataHub, or related capabilities.
Investigate quality failures with Data Engineers and convert recurring defects into automated regression tests or preventative controls.

Quality Standards & Enablement

Establish reusable data-testing standards, methodologies, templates, and best practices.
Define expectations for test planning, evidence, defect documentation, and risk-based validation.
Help Data Engineers apply appropriate project-level testing while providing independent validation where additional assurance is warranted.
Mentor engineering teams on reconciliation, test-data design, regression testing, and data-quality engineering practices.
Continuously improve test coverage and automation based on business impact and risk.

Basic Qualifications:

6+ years of experience in Data Quality Engineering, Data Testing, Quality Engineering, Data Engineering, or a related discipline, including significant experience testing production data systems.
Strong hands-on experience with ETL/ELT and end-to-end data pipeline testing.
Strong experience with source-to-target reconciliation, regression testing, and large-dataset validation.
Advanced SQL skills for data analysis, reconciliation, comparison, and validation.
Strong scripting or test-automation skills, preferably Python.
Experience designing automated data-testing or data-quality frameworks.
Experience creating test cases, expected results, and curated test datasets for complex data scenarios.
Experience validating data in modern cloud data platforms; Snowflake experience is preferred.
Experience testing pipelines built with technologies such as dbt, Apache Airflow, AWS Glue, or comparable ETL/ELT frameworks.
Strong understanding of data-quality dimensions including accuracy, completeness, consistency, uniqueness, validity, freshness, referential integrity, and distribution.
Experience with defect analysis, release validation, and root-cause investigation.
Ability to work directly with business SMEs to translate complex domain requirements into measurable test scenarios.
Strong analytical and communication skills, including the ability to explain quality findings and risks to both technical and business audiences.

Preferred Qualifications:

Experience with several of the following would be valuable:

dbt testing and custom tests
Amazon MWAA / Apache Airflow
AWS Glue and S3
DataHub or similar metadata/catalog platforms
Data profiling, anomaly detection, and statistical or distribution-based validation
Data-quality scorecards and quality KPIs
CI/CD integration for automated data testing
Large-scale or high-volume data validation
Experience with analytical, research, economic, financial, real-estate, or other complex domain datasets

You do not need to be an expert in every technology in our environment. We are looking for strong data-testing fundamentals, analytical depth, automation capability, and the ability to understand both the technical and business meaning of data.

Success means creating a data-quality capability where:

Critical data sets have documented, repeatable, and risk-appropriate test coverage.
Business definitions and expected outcomes are translated into measurable tests.
Reusable test data and expected results cover critical scenarios and edge cases.
Data pipelines are validated from source through published output.
Regression and reconciliation tests identify unintended changes before publication.
Critical quality failures prevent incorrect data from reaching downstream products.
Recurring production issues become automated regression coverage.
Data Engineers can use shared testing capabilities across projects.
Business teams have greater confidence that published data reflects agreed definitions, methodologies and expected outcomes.

What's in it for you?

When you join CoStar Group, you’ll experience a collaborative and innovative culture working alongside the best and brightest to empower our people and customers to succeed.

We offer you generous compensation and performance-based incentives. CoStar Group also invests in your professional and academic growth with internal training and tuition reimbursement.

Our benefits package includes (but is not limited to):
Comprehensive healthcare coverage: Medical / Vision / Dental / Prescription Drug
Life, legal, and supplementary insurance
Virtual and in person mental health counseling services for individuals and family
Commuter and parking benefits
401(K) retirement plan with matching contributions
Employee stock purchase plan
Paid time off
Tuition reimbursement
On-site fitness center and/or reimbursed fitness center membership costs (location dependent)
Access to CoStar Group’s Employee Resource Groups
Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks

The final salary or hourly rate offered for this role will fall within the range set forth below based on a variety of factors, including but not limited to, geographic location, skills, and competencies.

Base Compensation: CAD $120,000-$150,000 (annually)

We welcome all qualified candidates who are currently eligible to work full-time in Canada to apply. However, please note that CoStar Group is not able to provide visa sponsorship for this position.

<br>

CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing

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More about this job

Responsibilities

The Senior Data Quality Engineer will design and execute testing strategies for ETL/ELT pipelines to ensure data accuracy, completeness, and consistency. They will partner with cross-functional teams to translate business requirements into measurable test scenarios and build automated validation frameworks.

Requirements

Candidates must have 6+ years of experience in data quality or engineering with strong hands-on skills in SQL, Python, and cloud data platforms like Snowflake. The role requires expertise in end-to-end pipeline testing, reconciliation, and the ability to collaborate effectively with business subject-matter experts.

Skills

Data quality engineering
ETL/ELT
SQL
Python
Snowflake
Data pipeline testing
Regression testing
dbt
Apache Airflow
AWS Glue
Data validation
Test automation
Quality assurance
Data modeling
Cloud platforms

Benefits

Medical insurance
Vision insurance
Dental insurance
Prescription drug coverage
Life insurance
Legal insurance
Supplementary insurance
Mental health counseling services
Commuter benefits
Parking benefits
401(k) retirement plan
Employee stock purchase plan
Paid time off
Tuition reimbursement
Fitness center membership

Visa sponsorship

Not detected in the job text

Keywords

Data Quality Engineering
Snowflake
AWS Aurora
Amazon MWAA
Apache Airflow
dbt
AWS Glue
Amazon S3
DataHub
Grafana
CloudWatch
ETL
ELT
Python
SQL
Regression Testing
Data Pipeline
Test Automation
CI/CD
Data Governance
Real Estate
Analytics
Data Validation
Quality Assurance
Data Engineering
Business rules
Metadata
Anomaly detection
KPIs

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